manganel.js

$(document).keydown( function(event) {
  if (event.which === 39) {
	$('.next').each(function(){
	var href = $(this).attr('href');
	document.location.href=href;

  });
  }
});

$(document).keydown( function(event) {
  if (event.which === 37) {
	$('.back').each(function(){
	var href = $(this).attr('href');
	document.location.href=href;

  });
  }
});